Grinder rotor



E. R. BRAKE v GRINDER ROTOR Jan. 22, 1952 Filed May 6, 1950 f/YVE/YTOE EDGAR IQ. BRAKE i /44 HTT'Y.

Patented Jan. 22, 1952 ram OFFICE GRIN ER Boron EdganRJBrake, Golumbus, Ohio, assignor toThe Jcfirey Manufacturing Company; a corporation millino ApplicatiomMayfi, 1950, Serial No. 160,565

.1 Claim. I (01. 241- 191) This invention --relates I to I grinders and more particularly to'the rotors that are employedin grinders.

Anobject of the inventionds-to provide an improved grinder rotor including cooperating expansible body and hub members or parts having I cam means so constructed that when they are clamped: together. upon a rotor shaft the rotor becomes locked to the shaft 'upon which it is mounted .and=to each other and to :removable, renewable memberslthat: carry I material reducing elements. I

Other obj ects: of theinventionwill appear hereinafter, the novel ,features and combinations being set 'forth in-theappended claim.

In the accompanyingdrawings:

Fig. 1 is a side view in elevation of a garbage grinder including the invention, with parts broken away and parts in section;

Fig. 2 isyanend :view in elevation-of the grinder seen in Big. 1, with parts broken away; and

Figm3-is a view in section through the rotor of the grinder, the section being taken onthe line 3-3 of Fig. '1.

The garbage-grinder! shown in therdrawings includes 'an electric motor II, the housing of whichincl-udes a base I2 adapted to bemounted uponany suitable support. To one side of the motor housing there insecuredthe body casting I3 of the garbage grinder- .Bqdy casting I 3 includesa flanged side member QI4 that issecured directly to the motor housing by a plurality of cap screws I5. Side member I4 of the body casting I3 includes an opening I3 through which the shaft I1 of the motor extends into body casting I3. The side member or wall I8 of body casting I3 opposite side member or wall I4 includes a circular opening closed by a disc-like plate l9 secured to the body casting I3 by a plurality of cap screws 20. The diameter of the opening closed by plate I9 is such that a rotor assembly 2I may be inserted through it and onto the motor shaft I1.

Body casting I3 includes a feed opening 22 at its top through which garbage is fed into a grinder housing 23 formed in part by the body casting I3 and plate I9. Body casting I3 at its lower end forms an outlet opening 24 that is threaded and is received by a T 25 attached to a pipe 26 that leads to a sewer, not shown.

Body casting I3 carries two replaceable liner or wear plates 21 and 28 each secured to an inside wall thereof by bolts 29. Between the lower ends of liner plates 2] and 28 there is an arcuate perforated grid plate 30 that cooperates With-the-rotor assembly 2I in grinding garbage. The ground garbage which passes throughthe perforations 3| in grid plate 33 passes-downwardly through outlet opening 24 and is conveyed to the sewer through the T 25 and pipe 26.

Rotor assembly 2 I' includes a tapered or frustoconical hub 33 that is split radially and-axially at 34 to make it compressible. Hub'33 includes a shouldered bore 35 which opposite'the split 34 provides a'keyway 36. Hub 33 is carried'by the shaft I! of motor II with-the ,keyway (iii-being received by a key 31 in shaft I1.

Hub 33 carries a cylindrical rotor body member 38 that includes a tapered orfrusto-conical bore adapted to be received by the outer taperedsurface of hub 33. The cylindricalrotor member '38 is split radially and-axially at'3-9 to makei-t expansible. Split 39, as seen in Fig. 3, is Opposite the split 34 in hub 33 when the rotor is-assembled. The cylindrical member 3B fits over hub 33, and the frusto-conical surfaces of hub 33 and cylindrical member 23 cooperate to form cam surfaces which when the cylindrical member 38 is clamped upon the hub 33 cause the hub '33 to be compressed upon the motor shaft H and the cylindrical member 38 to be expanded. Cylindrical member 33 is clamped upon'hub '33 by two cap screws 43, the heads of which seat in recesses in one side of member '38 and extend through a web thereof into hub 33. It will be seen that when cap screws 49 are'tightened they will draw. or clamp the member 38 over hub 33.

The cylindrical rotor member 38 is slotted to carry a key 45 and upon its outer surface it carries a plurality of relatively thin ring members 42. Each ring member 42 includes three teeth or material reducing members 43 that are equally radially spaced thereon. Each of the ring members is slotted at M and 45 so that the rings may be placed upon member 38, successively, rotated with respect to each other. This arrangement of the rings 42 and key slots 44 and 45 permits rings 42 to be identical in construction and to be placed upon member 38 so that the teeth 43 of the alternate rings are staggered radially with respect to each other, with the key 4! positively locking the rings 42 against rotary movement upon the member 38. The ring members 42 and key M are retained against axial movement with respect to the cylindrical rotor member 38 by a snap ring 46 and a shoulder 41.

It will be seen that the rotor assembly 2I may be placed upon the end of motor shaft I! by inserting it through the circular opening in side wall I8 of casting I3 and onto the end of motor shaft I1. Proper positioning of the rotor assembly '2! upon the shaft H is assured because the end of the shaft engages the abutment 48 formed by the stepped bore 35 of hub 33 Upon tightening the clamp screws, the cylindrical rotor member 38 is clamped through the cooperation of the cam surfaces provided by the tapered bore of cylindrical rotor member 38 and the tapered outer surface of hub 33 to compress the latter upon motor shaft l1 and to expand the cylindrical rotor member 38 within the ring members 42. When the clamp screws 40 are loosened the rotor assembly 2| may be withdrawn from the end of the motor shaft I! through the circular opening in the wall it of body casting I3. The cylindrical rotor member 38 includes a threaded opening or bore 49 (see Fig. 2) through which a threaded tool or one of the bolts 40 may be threaded. Opening or bore 49 is positioned so that the bolt by abutting the end of hub 33 may act as a puller to draw or pull the member 38 off of member 33.

From the foregoing description it will be obvious that a grinder rotor is provided by this invention having improved construction wherein the rotor assembly includes members having cam surfaces which cooperate to clamp the rotor assembly upon the motor shaft and to clamp the ring members of the assembly that carry the material reducing elements thereto. It will also be seen that there is provided a material reducing rotor that may be removed readily from the grinder merely by the loosening of a clamping device and that the rotor assembly when replaced upon the shaft may be locked thereto merely by the tightening of the clamping device and that when the clamping device is tightened all of the parts of the rotor assembly are tightened together.

One of the chief advantages flowing from the invention is the fact that it provides a rotor in which substantially the only wearing or expendable parts are the identical rings 42. Rings 42 are relatively easily and inexpensively manufactured, and the body member 38 of rotor assembly 2| is readily removable from te grinder to facilitate the replacement of the rings 42.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claim hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

A grinder rotor assembly including ring members carrying material reducing teeth and adapted to be mounted upon a shaft, said assembly comprising a hub having an outer tapered surface split radially and axially to make the hub compressible when mounted on said shaft, the hub having a shouldered bore providing a keyway for receiving a key in said shaft, a cylindrical rotor body. carried on said hub and having a tapered bore adapted to be received over the outer tapered surface of said hub, said rotor body being split radially and axially to make the rotor body expansible when mounted on the hub, said tapered surfaces of the hub and rotor body engaging to form cam surfaces which cause the hub to be compressed on said shaft and the rotor body to be expanded within said ring members when the rotor body is clamped upon the hub, means for drawing the rotor body over the hub whereby said rotor body and hub are clamped together, said ring members being carried on the outer surface of said rotor body and having said teeth equally radially spaced thereon, and said ring members having a slot to receive a key for locking the ring members to said rotor body whereby the ring members can be mounted with the teeth of alternate ring members staggered radially with respect to each other.

EDGAR R. BRAICE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 738,445 Hofimann Sept. 8, 1903 929,762 Hess Aug. 3, 1909 1,226,896 Lane May 22, .1917

1,965,033 Dillon July 3, 1934 2,396,414 Firth Mar. 12, 1946 2,482,662 Dunne Sept. 20, 1949 FOREIGN PATENTS Number Country Date 512,568 Great Britain Sept. 20, 1939 

